بررسی بافت میکرایت و رابطه آن با گسترش ریزتخلخل‌ها و تغییرات کیفیت مخزنی، سازند داریان، بخش مرکزی خلیج فارس

نوع مقاله : علمی -پژوهشی

نویسنده

دانشگاه تهران، دانشکده زمین‌شناسی

10.29252/esrj.9.1.118

چکیده

رخساره‌ها، محیط رسوبی، فرآیندهای دیاژنزی و ریزتخلخل­های موجود در سازند داریان در سه چاه از یک میدان در بخش مرکزی خلیج­فارس در این مطالعه مورد بررسی قرار گرفته است. نتایج نشان داد که سازند داریان از شش ریزرخساره کربناته تشکیل و در یک رمپ کربناته نهشته شده است. بررسی فرآیندهای دیاژنزی نشان داد که رسوبات پس از نهشته‌شدن در سه محیط دیاژنزی دریایی، جوی و تدفینی قرار گرفته‌اند. دیاژنز دریایی تأثیر زیادی بر روی این سازند نداشته است اما انحلال جوی سبب گردیده تا برخی دانه‌ها حل شده و دانه‌های میکرایت گرد شوند. در محیط دفنی فضاهای خالی انحلالی ایجاد شده با سیمان کلسیتی پر شده است و در نتیجه تخلخل کاهش یافته است. در مطالعات پتروگرافی تخلخل زیادی در نمونه‌ها مشاهده نمی‌گردد اما آزمایشات معمول مغزه، تخلخل قابل ملاحظه‌ای را در این نمونه‌ها نشان می‌دهد و این امر تأییدکننده حضور ریزتخلخل­ها به­عنوان اصلی‌ترین نوع تخلخل در نمونه‌ها است. بررسی نمونه‌های میکرایتی با استفاده از میکروسکوپ الکترونی نشان داد که دانه‌های میکرایت، گردشده با تماس نقطه‌ای هستند. گردشدگی دانه‌ها سبب شده تا تخلخل زیادی در آنان ایجاد گردد. نوع تماس نقطه‌ای نیز سبب شده است تا این تخلخل در طی دیاژنز عمیق حفظ گردد. بررسی ارتباط بین ریزتخلخل­ها با رخساره‌ها و محیط رسوبی نشان می‌دهد این نوع از تخلخل در همه رخساره‌های گل‌پشتیبان دیده می‌شود و با عمیق‌تر شدن محیط رسوبی و افزایش میزان میکرایت در نمونه‌ها، ریزتخلخل موجود در آنان نیز افزایش می‌یابد.

کلیدواژه‌ها


عنوان مقاله [English]

Consideration of Micrite Texture and its Relationship with Microporosity Development and Reservoir Quality, Dariyan Formation, Central Persian Gulf

چکیده [English]

The focus of this study is on the facies, sedimentary environments, diagenetic processes and microporosity of Dariyan Formation in three wells of one field in central Persian Gulf. The results showed that the Dariyan Formation is made from six microfacies and has been deposited in six sub-environments. Regarding the sub-environments of the microfacies, lack of widespread carbonate shoals, gradational change of facies into one another, lack of talus sediments and slumping structures, these facies have been deposited in a carbonate ramp environment. Consideration of the diagenetic processes in this formation showed that sediments experienced marine, meteoric and burial diagenesis. Regarding the mud-dominated nature of the most samples, marine diagenesis has no considerable effect on them while meteoric effect is significant. The meteoric diagenesis caused dissolution of grains and increased roundness of micrites. The resulted empty voids have been cemented with calcite in burial diagenetic environment. No considerable porosity is visible in petrographical studies while routine core porosity measurements show high empty spaces. This proves the role of microporosity as the main pore type in these samples. Study of mud-dominated samples with scanning electron microscope showed that the micrites are rounded with punctic contacts and this caused creation and remaining of high porosity amount in the samples. Consideration the relationship between facies, sedimentary environments and microporosity in this formation shows that this type of porosity exists in all mud-dominated facies and increase with increasing depth of deposition and resulted increasing micrite content.

کلیدواژه‌ها [English]

  • Dariyan Formation
  • Micrite texture
  • Microporosity
  • Persian Gulf
  • Reservoir quality
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